The helicopter had taken off from a field near Newbridge and made a short flight to a landing site at Castlewarden.Two Pilots, one of whom was the owner, were on board.On the third attempt to land, control of the helicopter was lost; the helicopter struck trees and impacted heavily along the eastern boundary of the intended landing site.The owner who was occupying the right-hand seat suffered serious injuries; the left seat occupant was not injured.There was no fire.